Pole lock



J. J. BRIGGS POLE LOCK Jan. 8, 1935.

Filed July 29, 1932 Inventor Patented Jan. 8, 1935 PATENT OFFi-cE" POLELOCK Jefierson J. Briggs, Minneapolis, Minm Application July" 29,1932,Serial Nmtzsasv v Claims. (o zin -63y This invention relates to polelocks. Objects-of this invention are to provide a de vice foruse with"lamps suspended by pulleys,

such as from a mast armorcenter suspension- 51' construction, which isso madethat the device iscomposed essentially of twonormallyinterengaging-V portions, one ofwhichiscarried by the free end ofthe-chain or rope which suspends the lamp, and the other of which isattached to P the pole, the device being so-made that the two parts maybe readily locked together.

Further objects of this invention are to provide lock-ingtmeans whichisso constructed that it prevents-unauthorizedtampering or releasing,

1 which can only bev released by authorized persons equipped with a:suitable tool: or instrument, in whichtheilower endof the device isprovided with-a loop which-is always; free even in its attachedposition, and therebypermits the operator to hookon his extension linewithout first detachingithe device from the polea Further objectsare to-provide a construction having the above characteristics which .never-'theless is very simpleandwhich has no fragile, and no exposed partsethat may be readily dam' aged'by stones or by being struck.

An embodiment of the invention is shown in the; accompanying drawing, inwhich:-

Figure 1 is-a fragmentary view of a pole with thedeviceattached thereto;

Figure 2, is a sectional View drawnto an ,enlargedscale and taken on theline 2-2 of Figure 1, vsuch View omitting the chain. v Figure 3..is afragmentary view from the inner side of the device with the cover plateor chain locking plate removed, parts" being broken away and in section.o I I Figure dis a fragmentary detail showing the manner in which thedevice is unlocked from the pole.

Referring tov the drawing, it will be seen that the device comprises ananchoring" member 1 which is attached'to a pole'2by means of bolts orlagscrews 3. I Preferably the member 1 is slightly transversely curved tofit the' curved face of the pole.

.The member 1 carries a-centrally located stud 4 which is rigidlyattachedthereto and-which is provided withan enlarged'cylindricalthreaded portion 5 andwitha reduced stud orprojecting endfi.

The chain oricable receiving member 7 is provided withan annular orelliptical recessed portion 8 opening towards its innerrside and adaptedto receive the chain or cable 9' in the manner shown in Figure 3. Theside walls 10 surrounding the recess 8 are provided with an uppernotch11 and a lower notch 12. The lower notch 12 may, if desired, and asshown on the drawing, be'largerthan the'upp'er notch 11. The centralportion is providedwith a raised inwardly located 'bos'si 13 which isapertured and threaded andreceives the screw 14. V v

The chain-or cable 9 is passed through the uppernotch- 11 and is laid orwrapped around the-central: boss or inwardly projecting portion 13., asshown-in Figure 3. Thereafter the. cover plate or-cablelocking plate 15is positioned: over the chain -and is held in place by the screw 14,asshown most clearly in Figures zand 3. The head 16 of the screw is ontheinner sideof the coverplate or. locking plate 15 and is consequentlynot accessible to anyone who desires totamper with the device;Therefore, it isclearthat the cover plate cannot-be released-byanunauthori'zed person, and the chain or cable cannot, therefore, bedetached fromthe'member 7. y Y

Itis to be noted also that-inthe event a chain is used, one ofthelinksisprefrably shouldered against-the upper portionof the wall 10,as shown in Figure, 3. Itis-tobe noted particularly that the cover plate15 is provided with anupper ear 1 and alarger lowerear: 18whichrespectively fit into-the notches-1L and 12, and thus prevent thecover plate from turning. in additionto this, it causes-the properalignment of the cover plate with-the recessedportion and insures theproper relative positioning of Y these parts, sothat the-cover platemaybe draw-ninwardly'flush with the inner surface of-the member 7. Inaddition to this, the upper tongue 17 presses downwardly against'thatportion ofthe chainor cable which passes through the notch 11,and-tightly-anchors the chainor cable in the Thelower portion ofthemember 7 is provided with an elliptical or "elongated looped member19 within which is located the attaching nut or attaching member'20;This attaching member is provided with-anannular recess 21 in theopposite sides of which the arms of the portion 19 loosely fit, therebyallowing free rotation of the member 20, butpreventing removal of-themember 20-from the looped portion-19.-

' In addition to this, it is-apparent from Figures 1 and Z-that thelooped member 19 wedges against the locking member 20 and prevents thelocking member 20'from resting at -the bottom portion of the'loop. Thisallows roomfor the free insertion of thehook indicated in dotted linesat 22, which-isattached'to the operators extension rope23, while thedevice is locked in place to the pole. 'This is shown mostclearlylini-igure2.

The'nut 'or attaching member 20 is internally threaded and-is screwedupon the threaded portion 5 of? the fixed-stem. This nut 20 iscylindrical in contour and is provided; withone or more: radial recesses24 adapted' to receive the hooked end 25 of a spannenwrench-ZG, as shownIt is to be noted that the threaded hole in the nut 20 does not extendcompletely through the nut, but that its bottom strikes theprojectingstub or stud 6 of the pin and therein enables the nut to betightly locked in place without damage T to the threads either of thepin or of the-nut.

When the operator desires to lower the lamp or other suspended member,he merely hooks the" hook 22 in the lower free end. of the loop 19 andthereafter unscrews the nut 20. There isno danger of the lamp dropping,as it is already attached to the .extension'rope 20 of the operator.

In orderto avoid needless repetition, the chain or cablewill-hereinafter be referred to asia cable, it being understood,however, that this term is used not in aspecific sense but in a genericsense to covera chain, rope, cable, or other suspension member. Further;it is to be understood that the expression pole is intended to cover anyfixed member'such as a wall or-a pole, depending, of course, irom whatpoint the lamp is suspended.

It is apparent also that the device has no projecting or fr'agile partsthat can be damaged by stones or' by being struclnbut instead is ofstrong substantial construction and also is very simple and is easy tomake.

Although this invention has been described in considerable detail, it isto beunderstood that such description is intended as illustrative ratherthan limiting, as the invention may be variously embodied and is to beinterpreted as claimed. a

I claim:.

1. A polelock for a cable comprising an anchoring member rigidlyattached to the pole and having anoutwardly projecting threaded stud, acablev receiving member securely attached to the cable and havingadownwardly looped portion, and a nut revolubly and permanently carriedby said cable receiving member and internally threadedfor cooperationwith said threaded stud. I

2. A polelock for a cable comprising an anchoring member rigidlyattached to the pole and having an outwardly projecting threaded stud, acable receiving member securely attached to the cable and h'aving adownwardly looped portion, and af nut revolubly and permanently carriedby saidcable receiving member and internally threaded for cooperationwith said threaded stud,said nut having an annulargroove formed therein,said cable receiving member havinga looped portion fitting within theannular groove of saidnutand continuing downwardly to form a downwardlyextending continuation of said looped portion spaced at all times fromsaid nut for the reception of a hook.

3. A pole lock for a cable comprising ananchoring member adapted forattachment to a pole and having an outwardly projecting threaded studprovided with a reduced stub portion projecting therefrom, 'a cablereceiving member, a nut revolubly carried by said cable receivingmember'a'nd having an internally threaded aperture and adapted tocooperate with said threaded stud, said aperture extending only part waythrough saidnut and leaving a bottom wall adapted to contact with theprojecting stub portion of said threaded stud when said nut is screwedtightlyin place. I

4. A pole lock for a cable comprising an anchoring member adapted forattachment to a pole and having an outwardly projecting threaded studprovided with a reduced stub portion projecting therefrom, a cablereceiving member, a nut revolubly carried by said cable receiving memberand having an internally threaded aperture and adapted to cooperate withsaid threaded stud, said aperture extending only part way through saidnut and leaving a bottom wall adapted to contact with the projectingstub portion of said threaded stud when said nut is screwed tightly inplace, said nut being provided with an annular groove formed therein,and said cable receiving member having a looped portion fitting withinthe annular groove of said nut and converging towards the lower end ofthe looped portion, whereby the lower end of the looped portion isspaced from said nut when the device is in position.

5,. A pole lock for a cable comprising anchoring means adapted forattachment to a pole, a cable receiving member having means interlockingwith the said anchoring means, said cable receiving member having anannular recess adapted to receive the cable and having a notch throughwhich the cable projects, and a cover plate closing said annular recessand clamping said cable in place, said cover plate having an earpositioned in said notch and bearing upon said cable and tightlyanchoring said cable in the notch.

6. A pole lock comprising anchoring means adapted for attachment to apole and having a projecting threaded stud, a cable receiving memberhaving a downwardly extending looped portion, an internally threaded nutadapted to cooperate with said threaded stud and revolubly positionedwithin the looped portion of said cable receiving member, said nuthaving a substantially cylindrical exterior surface and having a radialaperture, said looped portion converging towards its lower end toprovide a part spaced at all times from said nut, said cable receivingmember having its upper end provided with a peripheral wall surroundingan annular space and having an upper notch through which the cable maybe passed, the free end of the cable being receivable within the annularspace, a cover plate adapted to enter the annular space and having anear adapted for positioning within the notch in the peripheral wall, anda headed locking screw passing through the cover plate with its headlocated adjacent said cover plate, said screw being threaded into saidcable receiving member.

'7. A pole lock for a cable comprising anchoring means for attachment toa pole, a cable receiving member having means interlocking with saidanchoring means to hold a predetermined face of said cable receivingmember presented towards the pole when said means are interlocked, saidcable receiving member including two parts,

one of which constitutes a body portion provided with an annular recessadapted to receive a cable, and the other of which constitutes a coverplate and jointly enclosing that portion of the cable within saidannular recess, said cover plate contacting with the margins of the bodyportion surrounding the cable receiving recess, and a headed screwlocking said two parts together with the head of said screw on the sideof said cable receiving member presented towards said pole.

' JEFFERSON J. BRIGGS.

